Sandy/Sandstone/Shale areas are more likely to be frost hollows than Clay soils. Clay tends to retain water content than sandy as the latter drains much more effectively into the Sub soil.

Cannock Chase in the English Midlands is a Sand Stone rising plug of heath land 26 miles by 12 miles at the base and to a height of 600 ft. higher than the River Trent to its North East.
The heath land is very frost prone, yet the clay river bottom area is not.

A second feature of air frosts is that the cold air flows like a river as it’s much denser than slightly warmer air which is still losing heat.

Where you have a slightly inclined plain the drainage dips or valleys,channel the cold frosty air and dips the temperature even more, than the surrounding still air. What is even more surprising is the river of 0C- cold air can be as little as 12ft in height and the width of the valley feature.

I remember a time when corn was not planted that far north. Barley and oats dominated. The reason was late frost risk. I suspect now that the cycle has turned, barley and oats will again gain favor.

Likely, too, the use of buckwheat as a catch crop.

Common farming in the 1960s…

Per “targeted”:

IMHO, the strong microbust downdrafts I learned about in ground school (private plane) and downed many planes in the 60s & 70s have also returned. Trees now shimmer in drafts next to others that are still. That wind must be vertical…